CN101917589A - Media data block descrambling method and device thereof - Google Patents
Media data block descrambling method and device thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
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Abstract
The invention discloses a media data block descrambling method and a device thereof. The method includes that: a descrambling module receives a control word from a condition receiving system; the descrambling module saves the control word; the descrambling module receives a media data block from a demultiplexing module; and the descrambling module utilizes the saved control word to descramble the data block. The invention ensures playing of program stream.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of media data block descrambling method and device.
Background technology
In recent years, especially the mobile TV technical development is rapid for digital mobile multimedia broadcasting technology, various television standards provide colourful content for the mobile multi-media broadcast terminal user, such as programs such as news, sports cast, variety, TV play and film, the user can select the service program of Mobile Multimedia Broadcasting according to the hobby of oneself.
The broadcasting running income of content operator in order to continue often provides paid MBMS service, and this just need carry out scrambling to program stream, just have only the user through authorizing can watch program.After the user is authorized, program receiving stream, the descrambling program stream just can be play then.
The user is in order to use mobile data services whenever and wherever possible, and need go up at receiving terminal (hereinafter to be referred as terminal) increases a broadcast singal receiving chip, realizes multimedia whereby, and cheap, is more welcome a kind of receiving terminal.
Fig. 1 is the schematic diagram according to the Mobile Multimedia Broadcasting scheme (terminal) of correlation technique, as shown in Figure 1, supports the terminal of multimedia broadcasting function of mobile to comprise media broadcast module and player module two parts at least.Wherein the media broadcast module is made up of a reception and demodulation chip, demultiplexing module, descrambling module and condition receiving system (Conditional AccessSystem abbreviates CAS as).Player module refers generally to the player on the terminals such as PC, palmtop PC (Personal Digital Assistant abbreviates PDA as) and mobile phone.
Particularly, receive reception and the demodulation of being responsible for digital broadcast signal with demodulation chip, obtain obtaining by the demultiplexing module demultiplexing behind the Frame media data block and Entitlement Control Message (the Entitlement Control Message of scrambling, abbreviate ECM as), give CAS module ECM then, give descrambling module the media data block of scrambling; Entitlement Management Message (Entitlement Management Message, abbreviate EMM as) can in broadcast channel, transmit, also can transmit (shown in Figure 1 is by the interactive channel transmission) by interactive channel and give CAS, the CAS module is calculated control word (Control Word according to EMM/ECM, abbreviate CW as), descrambling module obtains that the media data block to scrambling carries out descrambling behind the CW, obtains sending player module to behind the clear stream, and player module is decoded to clear stream and play.
Media data block and ECM issue through broadcast channel.For the purpose that the key wheel changes, key stream generally can once carry two keys, promptly comprises two CW, a media data block that is used for the descrambling current time, a media data block that is used for the next moment of descrambling in an ECM bag.At present the general strategy of terminal is: preserve two keys simultaneously, and the local key that upgrades in time along with the key updating of code stream.The descrambling module of terminal obtains at first needing media data block and CW are carried out synchronously behind the CW, correctly descrambling.
Fig. 2 is according to the key stream of correlation technique and the synchronous schematic diagram of Media Stream, as shown in Figure 2, represents key stream with Key stream, with A/V stream presentation medium stream.Because the key synchronization mechanism of terminal is to keep synchronously with code stream at any time, so the Key stream key stream preserved of terminal in fact just.K1 in the key stream, K2 represent first control word, second control word respectively, are placed in the square frame to comprise two CW in ECM bag of expression.K1 in the Media Stream represents that this media block must will fail with other control word descrambling with first control word descrambling.
But in the real system, the synchronous ideal case of key stream shown in Figure 2 and Media Stream be can not see basically.Its reason is that terminal has adopted DST PLAYER, and the Media Stream that first buffer memory is certain just begins descrambling before playing, and has caused key stream to compare Media Stream in advance.
Fig. 3 compares the schematic diagram that Media Stream shifts to an earlier date according to the key stream of correlation technique, wherein only adopts shade to represent to the media block of descrambling failure, and is identical among the definition of all the other each parameters and Fig. 2.As shown in Figure 3, compare under the situation that Media Stream shifts to an earlier date,, promptly produce the key step-out if can't find appropriate C W during media data block descrambling at key stream.The key step-out can cause the descrambling failure, and will cause the serious problems such as spending screen, pause even can't play in the playing process.
Summary of the invention
The descrambling failure of the media data block that causes at key step-out in the correlation technique, to cause the problem that program stream can't play and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of media data block descrambling method and device, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of media data block descrambling method.
Media data block descrambling method according to the present invention comprises: descrambling module receives the control word from condition receiving system; Descrambling module is preserved control word; Descrambling module receives the media data block from demultiplexing module; Descrambling module uses the control word of preserving, and media data block is carried out descrambling.
Further, descrambling module is preserved control word and comprised: descrambling module is preserved the control word database of control word in the descrambling module.
Further, descrambling module uses the control word of preserving, and media data block is carried out descrambling comprise: descrambling module searches whether there be the control word corresponding with media data block in the control word database; If lookup result then uses the control word of searching for being, media data block is carried out descrambling.
Further, before descrambling module received control word from condition receiving system, said method also comprised: demultiplexing module receives from receiving and the Frame of demodulation chip; Demultiplexing module demultiplexed data frame, authorized control information; Demultiplexing module sends Entitlement Control Message to condition receiving system; Condition receiving system receives Entitlement Management Message; Control information of condition receiving system use authority and Entitlement Management Message calculate control word.
Further, before descrambling module received media data block from demultiplexing module, said method also comprised: demultiplexing module receives from receiving and the Frame of demodulation chip; Demultiplexing module demultiplexed data frame obtains media data block.
Further, the control word of use preserving at descrambling module is carried out after the descrambling media data block, and said method also comprises: the media data block of descrambling module after player module sends descrambling; The media data block of player module after to descrambling decoded and play.
To achieve these goals, according to another aspect of the present invention, provide a kind of media data block descrambling device.
Media data block descrambling device according to the present invention comprises: first receiving element is used to receive the control word from condition receiving system; Preserve the unit, be used to preserve control word; Second receiving element is used to receive the media data block from demultiplexing module; The descrambling unit is used to use the control word of preservation, and media data block is carried out descrambling.
Further, the media data block descrambling device also comprises the control word database, preserves the unit and comprises: preserve subelement, be used to preserve control word to the control word database.
Further, the descrambling unit comprises: search subelement, be used for searching whether there be the control word corresponding with media data block at the control word database; The descrambling subelement, being used at lookup result is under the situation that is, uses the control word of searching, and media data block is carried out descrambling.
Further, above-mentioned media data block descrambling device also comprises: transmitting element is used for the media data block after player module sends descrambling, so that the media data block of player module after to descrambling decoded and play.
By the present invention, adopt descrambling module to preserve control word, and use the control word of preserving that media data block is carried out descrambling, solve the problem that the key step-out causes descrambling to fail in the correlation technique, and then guaranteed the broadcast of program stream.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the Mobile Multimedia Broadcasting scheme (terminal) of correlation technique;
Fig. 2 is according to the key stream of correlation technique and the synchronous schematic diagram of Media Stream;
Fig. 3 compares the schematic diagram that Media Stream shifts to an earlier date according to the key stream of correlation technique;
Fig. 4 is the schematic diagram according to the Mobile Multimedia Broadcasting scheme (terminal) of the embodiment of the invention;
Fig. 5 is the flow chart according to the media data block descrambling method of the embodiment of the invention;
Fig. 6 compares the schematic diagram that Media Stream also can not cause the key step-out in advance according to the key stream of the embodiment of the invention;
Fig. 7 is the flow chart of cipher key synchronization method according to the preferred embodiment of the invention;
Fig. 8 is the structured flowchart according to the media data block descrambling device of the embodiment of the invention;
Fig. 9 is the structured flowchart of media data block descrambling device according to the preferred embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 4 is the schematic diagram according to the Mobile Multimedia Broadcasting scheme (terminal) of the embodiment of the invention, as shown in Figure 4, comprises media broadcast module and player module two parts.Wherein the media broadcast module is made up of digital broadcast signal reception and demodulation chip, demultiplexing submodule, descrambling submodule, CAS submodule.The improvements of this programme are, have increased a local control word database of preserving control word in the descrambling submodule.
The invention provides a kind of media data block descrambling method, this method can realize based on Mobile Multimedia Broadcasting scheme (terminal) shown in Figure 4.Fig. 5 is the flow chart according to the media data block descrambling method of the embodiment of the invention, comprises that step S502 is to step S508.
Step S502, descrambling module receive the control word from condition receiving system.
Step S504, descrambling module is preserved control word.
Step S506, descrambling module receive the media data block from demultiplexing module.
Step S508, descrambling module uses the control word of preserving, and media data block is carried out descrambling.
In the correlation technique, the key step-out will cause the descrambling failure of media data block.In the embodiment of the invention, will be used for the control word that media data block is decoded is preserved, can guarantee media data block, and then guarantee the broadcast of program stream by correct decoding.
Fig. 6 compares the schematic diagram that Media Stream also can not cause the key step-out in advance according to the key stream of the embodiment of the invention, by comparing as can be seen with Fig. 3, because key stream has comprised more key, thereby has guaranteed being correctly decoded of media data block.
Preferably, descrambling module is preserved control word and comprised: descrambling module is preserved the control word database of control word in the descrambling module.
In this preferred embodiment, increase by one and be used for the local control word database of preserving control word, to be used for the control word that media data block is decoded is kept at the control word database, can guarantee media data block further, and then guarantee the broadcast of program stream by correct decoding.And, adopt the control word database that control word is preserved, implementation is simple, reliable.
Need to prove that local quantity of preserving control word should surpass the CW number (being generally 2) that is comprised among the ECM, so that satisfy the demand of terminal descrambling.
Preferably, descrambling module uses the control word of preserving, and media data block is carried out descrambling comprise: descrambling module searches whether there be the control word corresponding with media data block in the control word database; If lookup result then uses the control word of searching for being, media data block is carried out descrambling.
This preferred embodiment has been described and has been used the control word of preserving in the control word database media data block to be carried out the process of descrambling.By searching the control word corresponding, can guarantee media data block by correct decoding, and then guarantee the broadcast of program stream with media data block.
Preferably, before descrambling module received control word from condition receiving system, demultiplexing module received from receiving and the Frame of demodulation chip; Demultiplexing module demultiplexed data frame, authorized control information; Demultiplexing module sends Entitlement Control Message to condition receiving system; Condition receiving system receives Entitlement Management Message; Control information of condition receiving system use authority and Entitlement Management Message calculate control word.
This preferred embodiment has been described the process of demultiplexing module calculation control word, similar in its implementation and the prior art, be used in various encrypted multimedia agreements, the various player application with can need not to change, and possess good autgmentability, debugging property and adaptability widely.
Preferably, before descrambling module received media data block from demultiplexing module, demultiplexing module received from receiving and the Frame of demodulation chip; Demultiplexing module demultiplexed data frame obtains media data block.
This preferred embodiment has been described the process that demultiplexing module demultiplexed data frame obtains media data block, similar in its implementation and the prior art, be used in various encrypted multimedia agreements, the various player application with can need not to change, and possess good autgmentability, debugging property and adaptability widely.
Preferably, the control word of use preserving at descrambling module is carried out after the descrambling media data block of descrambling module after player module sends descrambling to media data block; The media data block of player module after to descrambling decoded and play.
This preferred embodiment has been described the process that the media data block of player module after to descrambling decoded and play, similar in its implementation and the prior art, be used in various encrypted multimedia agreements, the various player application with can need not to change, and possess good autgmentability, debugging property and adaptability widely.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Fig. 7 is the flow chart of cipher key synchronization method according to the preferred embodiment of the invention, as shown in Figure 7, comprises that following step S702 is to step S710.
Step S702 receives and the demodulation chip received signal obtains Frame, and gives demultiplexing module.
Step S704, demultiplexing module solves ECM and gives CAS, and the media data block that solves scrambling is given descrambling module.
Step S706, CAS pass to descrambling module after calculating CW according to the ECM that is with the outer EMM that transmits and received.
Step S708, descrambling module at first preserve CW to CW DB, search correct CW according to media data block in CW DB then, according to this CW notebook data piece descrambling are become clear stream.
Step S710, player module is decoded to clear stream and is play.
Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
The embodiment of the invention provides a kind of media data block descrambling device, and this media data block descrambling device can be used to realize above-mentioned.Fig. 8 is the structured flowchart according to the media data block descrambling device of the embodiment of the invention, comprises first receiving element 82, preserves unit 84, the second receiving elements 86 and descrambling unit 88.Below its structure is described in detail.
First receiving element 82 is used to receive the control word from condition receiving system; Preserve unit 84, be connected to first receiving element 82, be used to preserve the control word that first receiving element 82 receives; Second receiving element 86 is used to receive the media data block from demultiplexing module; Descrambling unit 88 is connected to and preserves the unit 84 and second receiving element 86, is used to use preserve the control word that unit 84 is preserved, and the media data block that second receiving element 86 is received carries out descrambling.
In the correlation technique, the key step-out will cause the descrambling failure of media data block.In the embodiment of the invention, will be used for the control word that media data block is decoded is preserved, can guarantee media data block, and then guarantee the broadcast of program stream by correct decoding.
Fig. 9 is the structured flowchart of media data block descrambling device according to the preferred embodiment of the invention.
Preferably, the media data block descrambling device also comprises the control word database, preserves unit 84 and comprises preservation subelement 842, is connected to first receiving element 82, is used to preserve the control word of first receiving element, 82 receptions to the control word database.
In this preferred embodiment, increase by one and be used for the local control word database of preserving control word, to be used for the control word that media data block is decoded is kept at the control word database, can guarantee media data block further, and then guarantee the broadcast of program stream by correct decoding.And, adopt the control word database that control word is preserved, implementation is simple, reliable.
Need to prove that local quantity of preserving control word should surpass the CW number (being generally 2) that is comprised among the ECM, so that satisfy the demand of terminal descrambling.
Preferably, descrambling unit 88 comprises: search subelement 882 and descrambling subelement 884, below its structure is described in detail.
This preferred embodiment has been described and has been used the control word of preserving in the control word database media data block to be carried out the process of descrambling.By searching the control word corresponding, can guarantee media data block by correct decoding, and then guarantee the broadcast of program stream with media data block.
Preferably, the media data block descrambling device also comprises transmitting element 89, be connected to descrambling unit 88, be used for the media data block after player module sends descrambling unit 88 descramblings, so that the media data block of player module after to descrambling unit 88 descramblings decoded and play.
This preferred embodiment has been described the process that the media data block of player module after to descrambling decoded and play, similar in its implementation and the prior art, be used in various encrypted multimedia agreements, the various player application with can need not to change, and possess good autgmentability, debugging property and adaptability widely.
Need to prove that the media data block descrambling device of describing among the device embodiment is corresponding to above-mentioned method embodiment, its concrete implementation procedure had been carried out detailed description in method embodiment, do not repeat them here.
In sum, according to the abovementioned embodiments of the present invention, a kind of media data block descrambling method and device are provided.Adopt descrambling module to preserve control word, and use the control word of preserving that media data block is carried out descrambling, solved the problem that the key step-out causes descrambling to fail in the correlation technique, and then guaranteed the broadcast of program stream.
Need to prove, said method all is effective to various terminal players and various Descrambling Algorithms such as ISMACryp (Internet Streaming Media Alliance Encryption andAuthentication), Security Real Time Protocol (Secure Real-time TransportProtocol abbreviates SRTP as), IPsec (IP Security).
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a media data block descrambling method is characterized in that, comprising:
Descrambling module receives the control word from condition receiving system;
Described descrambling module is preserved described control word;
Described descrambling module receives the media data block from demultiplexing module;
Described descrambling module uses the control word of described preservation, and described media data block is carried out descrambling.
2. method according to claim 1 is characterized in that, described descrambling module is preserved described control word and comprised:
Described descrambling module is preserved the control word database of described control word in the described descrambling module.
3. method according to claim 2 is characterized in that described descrambling module uses the control word of described preservation, described media data block is carried out descrambling comprise:
Described descrambling module searches whether there be the control word corresponding with described media data block in described control word database;
If lookup result then uses described control word of searching for being, described media data block is carried out descrambling.
4. according to each described method in the claim 1 to 3, it is characterized in that before described descrambling module received described control word from described condition receiving system, described method also comprised:
Described demultiplexing module receives the Frame from reception and demodulation chip;
The described Frame of described demultiplexing module demultiplexing, authorized control information;
Described demultiplexing module sends described Entitlement Control Message to described condition receiving system;
Described condition receiving system receives Entitlement Management Message;
Described condition receiving system uses described Entitlement Control Message and described Entitlement Management Message, calculates described control word.
5. according to each described method in the claim 1 to 3, it is characterized in that before described descrambling module received described media data block from described demultiplexing module, described method also comprised:
Described demultiplexing module receives the Frame from reception and demodulation chip;
The described Frame of described demultiplexing module demultiplexing obtains described media data block.
6. according to each described method in the claim 1 to 3, it is characterized in that, use the control word of described preservation at described descrambling module, described media data block is carried out after the descrambling, described method also comprises:
The media data block of described descrambling module after player module sends described descrambling;
The media data block of described player module after to described descrambling decoded and play.
7. a media data block descrambling device is characterized in that, comprising:
First receiving element is used to receive the control word from condition receiving system;
Preserve the unit, be used to preserve described control word;
Second receiving element is used to receive the media data block from demultiplexing module;
The descrambling unit is used to use the control word of described preservation, and described media data block is carried out descrambling.
8. media data block descrambling device according to claim 7 is characterized in that, described media data block descrambling device also comprises the control word database, and described preservation unit comprises:
Preserve subelement, be used to preserve described control word to described control word database.
9. media data block descrambling device according to claim 8 is characterized in that, described descrambling unit comprises:
Search subelement, be used for searching whether there be the control word corresponding with described media data block at described control word database;
The descrambling subelement, being used at lookup result is under the situation that is, uses described control word of searching, and described media data block is carried out descrambling.
10. according to each described media data block descrambling device in the claim 7 to 9, it is characterized in that, also comprise:
Transmitting element is used for the media data block after player module sends described descrambling, so that the media data block of described player module after to described descrambling decoded and play.
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| CN2010102670921A CN101917589A (en) | 2010-08-23 | 2010-08-23 | Media data block descrambling method and device thereof |
| PCT/CN2011/072116 WO2012024921A1 (en) | 2010-08-23 | 2011-03-24 | Method and device for descrambling media data blocks |
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| CN2010102670921A CN101917589A (en) | 2010-08-23 | 2010-08-23 | Media data block descrambling method and device thereof |
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| WO2012024921A1 (en) * | 2010-08-23 | 2012-03-01 | 中兴通讯股份有限公司 | Method and device for descrambling media data blocks |
| CN102164320A (en) * | 2011-04-11 | 2011-08-24 | 北京数字太和科技有限责任公司 | Improved terminal based on conditional access technology |
| WO2012139481A1 (en) * | 2011-04-11 | 2012-10-18 | 北京数字太和科技有限责任公司 | Terminal based on conditional access technology |
| CN102164320B (en) * | 2011-04-11 | 2016-06-22 | 北京数字太和科技有限责任公司 | A kind of terminal based on conditional access technology of improvement |
| US9479825B2 (en) | 2011-04-11 | 2016-10-25 | Unitend Technologies Inc. | Terminal based on conditional access technology |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012024921A1 (en) | 2012-03-01 |
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